module ActionView module Helpers # Provides a set of methods for making easy links and getting urls that depend on the controller and action. This means that # you can use the same format for links in the views that you do in the controller. The different methods are even named # synchronously, so link_to uses that same url as is generated by url_for, which again is the same url used for # redirection in redirect_to. module UrlHelper # Returns the URL for the set of +options+ provided. This takes the same options # as url_for. For a list, see the url_for documentation in link:classes/ActionController/Base.html#M000079. def url_for(options = {}, *parameters_for_method_reference) if Hash === options then options = { :only_path => true }.update(options.stringify_keys) end @controller.send(:url_for, options, *parameters_for_method_reference) end # Creates a link tag of the given +name+ using an URL created by the set of +options+. See the valid options in # link:classes/ActionController/Base.html#M000021. It's also possible to pass a string instead of an options hash to # get a link tag that just points without consideration. If nil is passed as a name, the link itself will become the name. # The html_options have a special feature for creating javascript confirm alerts where if you pass :confirm => 'Are you sure?', # the link will be guarded with a JS popup asking that question. If the user accepts, the link is processed, otherwise not. # # Example: # link_to "Delete this page", { :action => "destroy", :id => @page.id }, :confirm => "Are you sure?" def link_to(name, options = {}, html_options = nil, *parameters_for_method_reference) html_options = (html_options || {}).stringify_keys convert_confirm_option_to_javascript!(html_options) if options.is_a?(String) content_tag "a", name || options, (html_options || {}).merge("href" => options) else content_tag( "a", name || url_for(options, *parameters_for_method_reference), (html_options || {}).merge("href" => url_for(options, *parameters_for_method_reference)) ) end end # Creates a link tag on the image residing at the +src+ using an URL created by the set of +options+. This takes the same options # as url_for. For a list, see the url_for documentation in link:classes/ActionController/Base.html#M000079. # It's also possible to pass a string instead of an options hash to get a link tag that just points without consideration. # The html_options works jointly for the image and ahref tag by letting the following special values enter the options on # the image and the rest goes to the ahref: # # * :alt - If no alt text is given, the file name part of the +src+ is used (capitalized and without the extension) # * :size - Supplied as "XxY", so "30x45" becomes width="30" and height="45" # * :border - Draws a border around the link # * :align - Sets the alignment, no special features # # The +src+ can be supplied as a... # * full path, like "/my_images/image.gif" # * file name, like "rss.gif", that gets expanded to "/images/rss.gif" # * file name without extension, like "logo", that gets expanded to "/images/logo.png" # # Examples: # link_image_to "logo", { :controller => "home" }, :alt => "Homepage", :size => "45x80" # link_image_to "delete", { :action => "destroy" }, :size => "10x10", :confirm => "Are you sure?", "class" => "admin" # # NOTE: This tag is deprecated. Combine the link_to and image_tag yourself instead, like: # link_to(image_tag("rss", :size => "30x45", :border => 0), "http://www.example.com") def link_image_to(src, options = {}, html_options = {}, *parameters_for_method_reference) image_options = { "src" => src.include?("/") ? src : "/images/#{src}" } image_options["src"] += ".png" unless image_options["src"].include?(".") html_options = html_options.stringify_keys if html_options["alt"] image_options["alt"] = html_options["alt"] html_options.delete "alt" else image_options["alt"] = src.split("/").last.split(".").first.capitalize end if html_options["size"] image_options["width"], image_options["height"] = html_options["size"].split("x") html_options.delete "size" end if html_options["border"] image_options["border"] = html_options["border"] html_options.delete "border" end if html_options["align"] image_options["align"] = html_options["align"] html_options.delete "align" end link_to(tag("img", image_options), options, html_options, *parameters_for_method_reference) end alias_method :link_to_image, :link_image_to # deprecated name # Creates a link tag of the given +name+ using an URL created by the set of +options+, unless the current # request uri is the same as the link's, in which case only the name is returned (or the # given block is yielded, if one exists). This is useful for creating link bars where you don't want to link # to the page currently being viewed. def link_to_unless_current(name, options = {}, html_options = {}, *parameters_for_method_reference, &block) link_to_unless current_page?(options), name, options, html_options, *parameters_for_method_reference, &block end # Create a link tag of the given +name+ using an URL created by the set of +options+, unless +condition+ # is true, in which case only the name is returned (or the given block is yielded, if one exists). def link_to_unless(condition, name, options = {}, html_options = {}, *parameters_for_method_reference, &block) if condition if block_given? block.arity <= 1 ? yield(name) : yield(name, options, html_options, *parameters_for_method_reference) else html_escape(name) end else link_to(name, options, html_options, *parameters_for_method_reference) end end # Create a link tag of the given +name+ using an URL created by the set of +options+, if +condition+ # is true, in which case only the name is returned (or the given block is yielded, if one exists). def link_to_if(condition, name, options = {}, html_options = {}, *parameters_for_method_reference, &block) link_to_unless !condition, name, options, html_options, *parameters_for_method_reference, &block end # Creates a link tag for starting an email to the specified email_address, which is also used as the name of the # link unless +name+ is specified. Additional HTML options, such as class or id, can be passed in the html_options hash. # # You can also make it difficult for spiders to harvest email address by obfuscating them. # Examples: # mail_to "me@domain.com", "My email", :encode => "javascript" # => # # # mail_to "me@domain.com", "My email", :encode => "hex" # => # My email def mail_to(email_address, name = nil, html_options = {}) html_options = html_options.stringify_keys encode = html_options.delete("encode") string = '' if encode == 'javascript' tmp = "document.write('#{content_tag("a", name || email_address, html_options.merge({ "href" => "mailto:"+email_address.to_s }))}');" for i in 0...tmp.length string << sprintf("%%%x",tmp[i]) end "" elsif encode == 'hex' for i in 0...email_address.length if email_address[i,1] =~ /\w/ string << sprintf("%%%x",email_address[i]) else string << email_address[i,1] end end content_tag "a", name || email_address, html_options.merge({ "href" => "mailto:#{string}" }) else content_tag "a", name || email_address, html_options.merge({ "href" => "mailto:#{email_address}" }) end end # Returns true if the current page uri is generated by the options passed (in url_for format). def current_page?(options) url_for(options) == @request.request_uri end private def convert_confirm_option_to_javascript!(html_options) if confirm = html_options.delete("confirm") html_options["onclick"] = "return confirm('#{confirm.gsub(/'/, '\\\\\'')}');" end end end end end